I also agree that it is Leptura (= Stictoleptura, = Corymbia) rubra - this group of longhorns seems to change genus names on a regular basis! In Andrew Duff's recent identification guide to longhorns, published in British Wildlife magazine, it is given the English name Red Longhorn Beetle. In that guide it says "a naturalised immigrant, very local in coniferous woodlands in eastern England".